If you use the default options of ESS about application modification detection , ESET will see that if svchost.exe has been updated from Microsoft and not bother you about it. Have you modified that option ?

When ESS displays that message again , see where svchost.exe is located on your computer and then upload a copy of it to www.virustotal.com
If some vendors find it possibly infected (the genuie Microsoft one must be 100% clean) , send a copy of it to samples@eset.sk

The legitimate place of the legitimate genuie svchost.exe is %windir%\system32\ but since the warning is for that file it means that the the first svchost you have had has been modified . ESS detected this during attemp for communication by the new svchost.exe
It might be a malware that has modified it . That is why it is important for you to double check this file . I think you must eliminate the possibility of infection or respectively false positive alarm from ESS.